remember a manger once said about the problems of our defensive vulnerability "somethings you can't coach", but the form of the defense proves the most important thing is organization and coaching, players can actually be trained to improve positioning and timing, go figure.
the team now has a true backbone, the fullbacks are now defense 1st, lining up in a tight flat back 4 shape without the ball, closing down attacks quickly with a midfielder to double team and center backs close to shield the exposed space, and the center midfield players cover for the out-going center backs.